Moving From Scotland to Here

Hi, I have been operating through MIUI Scotland until now, but have just got a notice Site is closing down. I am on build 2.6.15 at present. If I want to update to your latest version 2.6.29 can I just download the update Zip or do I have to Install the complete package. If so do I have to wipe Data etc.I think Miui is a very fine ROM and I look forward to the updates. Thank you